Gallocyanin dye.



CARL- HEIDENREICH AND EDUARD MARTZ, OF VOIIWINKELNEAR ELBERFELD, GERMANY-ASSIGNORS TO FARBENFABRIKEN VORM. FRIEDRBAYER MANY, A- CORPORATION OFGERMANY.

GALLOCYANIN DYE.

Specification of Letters Patent.

Petented Aug. 11, 1908.

Application filed April 11, 1908. Serial No. 426,500.

To all whom it may concern:

Be it known that we, CARL UEInnNREIon and EDUARD MARTZ, doctors ofphilosophy, chemists, citizens of the German Empire, re- 5 siding atVohwinkel, near Elbcri'eld, Germany, Kingdom of Prussia, have inventednew and useful Improvements in New Dyestull of the Gallocyaniu Series,of which the following is a specification.

()ur invention relates to the production of a new coloring matter whichis obtained by the action of para-nitroso-meta-ehlorodiethylanilin upongallzimic acid. It is distinguisheo from coelestin blue by the greenershade it reduces in dyeing or printing.

The fo lowing example will further illustrate, our invention, the partsbeing by weight: 17 parts of gallamic acid and 37 parts of thechlorhydrate of nitroso-meta- 20 chloro-diethylanilin are mixed togetherwith 250 parts of alcohol and the resulting mixture is heated on thewater-bath until the nitroso compound has disappeared. The dyestull' isfiltered oil and washed with water. It is a dark powder insoluble inwater and soluble in To produce a suitable product for printing)urposes, the coloring matter is converted by means of reducing agents(5. g. zine dust and hydrochloric acid into its yellowishgreenleuco-compound which produces with chrome mordants pure greenish-blueshades.

Having now described our invention and in what manner the same is to beperformed, we declare that What we claim, is

The herein-described new dyestull' obtainable by condensingpara-nitroso-metachlorodiethylanilin with gallamic acid, which is afterdrying a dark powder insoluble in water and soluble in dilutehydrochloric acid and in coi'lcentrated sulfuric acid with a violetcolor; yielding upon reduction a yellowish-green leuco-eompoundwhichproduces with chrome mordants pure greenish-blue shades, sub stantiallyas described.

In testimony whereotwe have hereunto set our hands in the presence oftwo sub-- scribing witnesses.

CARL HEIDENREICH. EDUARD MARTZ.

Witnesses.

OTTO KoNIe, WM. WASHINGTON BRUNSWICK.

& (10., OF ELBERFELD, GER-

